<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  .box {
    width: 100%;
    height: 200px;
    background: rgb(230,240,119);

    display: flex;
    /* flex-direction: column; */
      justify-content: space-around;
  }
  .item{
    width:50px;
    /* height: 100%; */
    background:red;
    border: 1px solid #ccc;
    
  }
  .item2{
    flex: 1;
  }
  .item3{
     flex:2;
  }
</style>

<body>

  <div class="box">
      <div class="item item1">1</div>
      <div class="item item2">2</div>
      <div class="item item3">3</div>
      <div class="item item4">4</div>
      <div class="item item5">5</div>
  </div>
</body>

</html>